My question is why haven’t feed prices dropped?
Check this out:

Farmers spent the last few years planting as much corn as they could, but with its price half what it was a couple of years ago, the crop’s golden luster has dulled and many growers are considering shifting acreage back to soybeans.

A December survey of more than 1,600 producers by Farm Futures, an agriculture-focused magazine and website publisher, indicated farmers intend to reduce corn planting to 92 million acres, a 3 percent reduction from last year, and boost soybeans about 7.6 percent over last year to 82.3 million acres. That would be a soybean acres record.